Firing mechanism for automatic arms



cs. REVEILLI 2,356,615

FIRING MECHANISM FOR AUTOMATIC ARMS Filed Dec. 12, 1939 Patented Aug.22, 1944 SA S Gino Revelli, Rome, Italy; vested in the Alien PropertyCustodian Application December 12, 1939, Serial No. 308,871 In ItalyDecember 23, 1938 2 Claims.

The present invention relates to automatic guns and more specificallypertains to the firing mechanism or trigger linkage for releasing thefiring An object of the invention resides in providing means forpreventing inadvertent discharge of the gun even though the trigger maybe maintained in an actuated position.

A more specific object of the invention resides in the provision of apivotal pawl which normally maintains the firing pin in a retractedposition including means for pivoting the pawl upon actuation of thetrigger and means for further pivoting the pawl to release the same fromthe trigger linkage so that the pawl may again retain the striker orfiring pin in a retracted position even though the trigger is notreleased.

Other objects and features of the invention will be apparent from aconsideration of the accompanying drawing and the following descriptionwherein an exemplary embodiment of the invention is disclosed.

In the drawing:

Fig. 1 is an enlarged elevational view of the firing mechanism showingthe parts thereof in a cocked position of the firing pin or striker withthe parts shown in dotted lines after the striker has been released.

Fig. 2 is a similar elevational view of part of the mechanism shown inFig. 1 after the striker or firing pin has been moved to a position todischarge the gun.

Fig. 3 is a side elevational view of the parts shown in Fig. 2 andillustrating the positions thereof during the initial forward movementof the striker.

Referring to the drawing there is shown at I a striker or firing pinwhich i urged forwardly by means of a spring 2 and a rod 3. The strikeror firing pin I is adapted to be retracted upon discharge of the gun ina conventional and well known manner.

The striker I carries a tooth 4 which is adapted to engage the surface 5of an arm carried by a pawl IS. The pawl or sear 6 is pivotally mountedon a pin I and the pawl is biased in a counterclockwise direction on thepin 1 by means of a sprin 8. An end 9 of the spring engages the pawl 6and another end II! of the spring is connected by means of a link II toan arm I2 of a lever I3. The lever I3 is pivotally connected at It to apivotal trigger I5. The lever or connector I3 is provided with an arm I6which extends along the lower part of the pawl 6 and the finger-shapedarm I6 is adapted to bear against the lower part II of the pawl 6. Thelever I3 is biased to such a position by means of the spring 8 which isconnected to the arm I2 by the link II. The finger portion I6 of thelever 13 is also provided with an arcuate surface 24 for engaging thecam-like surface ll of the pawl 6.

The lever I3 is also provided with detent means such as a tooth I8designed to engage a lug I9 of the pawl 6. The lug I9 is provided withtwo substantially fiat surfaces 20 and 2I arranged in slightly differentplanes and adapted to be successively engaged by the tooth I8 of thelever I3. The various parts of the trigger release mechanism areretained in the position illustrated in the full line of Fig. 1 when thestriker is in a retracted position by the spring 8. In such a positionthe finger portion I3 of the lever I3 bears against the lower part I! ofthe pawl 6 and the tooth 4 of the striker I engages the end surface 5 ofthe pawl and the striker or firing pin is thus retained in a retractedposition.

When the trigger I5 is actuated and moved to the dotted line positionshown in Fig. 1 the lever I3 is moved rearwardly and slightly downwardand the tooth I8 engaging the surface ZII pivots the pawl IS in aclockwise direction on the pin I. The tooth or detent I8 during furtherrearward movement of the lever I3 finally engages the surface 2| of thelug IS. The finger actuating the trigger I5 will perceive this firstrelease of the firing mechanism. During these movements of the lever I3the pawl 6 will be slightly pivoted and the surface II of the pawl 6will still .be adjacent the surface 24 of the lever I3.

Further actuation of the trigger I5 will cause the pawl 6 to be pivotedin a clockwise direction sufficiently for the tooth I to be released bythe pawl and the striker I will therefore move forward under the actionof the spring 2. The initial forward movement of the striker I willcause the cam-like projection 22 to engage the pawl 6 as shown in Fig.3. The cam or projection 22 will thus further pivot the pawl 6 in aclockwise direction on the pin I and move the lug I 9 away from thedetent or tooth I8 as shown in Fig. 3.

Thus the pawl Ii is completely disconnected from the lever I3 and thepawl 6 will thereafter be rotated in a counterclockwise direction on thepin I by means of the spring 8. The upper end 5 of the pawl Ii may thenengage the relatively straight surface 23 of the striker I.

Further forward movement of the striker will cause the discharge of thegun after which the striker or firing pin is retracted by the recoil ofthe gun. The retracted striker I however cannot again move forwardlyunder the action of the spring 2 since the pawl 6 with the surface 5thereof will be in a position to be engaged by the tooth 4 of thestriker. Thus the gun will not be again discharged even though thetrigger I5 is not released. In order to again release the firing pin Iit is necessary to permit the trigger l5 to assume an inoperativeposition whereby the detent 18 will again engage the lug l 9.

While the invention has been described with reference to specificstructural details it will be appreciated that changes may be madetherein by those skilled in the art. Such modifications may be madewithout departing from the spirit and scope of the invention as setforth in the appended claims.

I claim:

1. In an automatic gun, a striker having a tooth, yieldable meansbiasing the striker forwardly, a sear, a pivot pin, adjacent saidstriker, on which said sear is mounted, said sear being constructed andarranged to engage said tooth to hold said striker in retractedposition, said sear being formed with a lower cam surface and with alug, a trigger pivotally mounted rearwardly of the sear, a connectorpivotally connected to said trigger forwardly of the pivotal axis of thetrigger and extending along said cam surface and formed with a detentconstructed and arranged to engage said lug to move said sear fromholding position, and a spring coiled about said pin and having its endsconnected with said sear and connector respectively and bearing upwardlythereagainst and thereby biasing said sear to holding position, saidconnector to a position with said detent in engagement with said lug andsaid trigger to forward position, said striker being formed with a camsurface constructed and arranged to further move said sear and by saidfirst mentioned cam surface to disengage said detent from said lug. 2.The gun as set forth in claim 1 wherein said lug is formed with twostepped surfaces adapted to be engaged successively by said detent.

GINO REVELLL

